Wikimedia Commons has media related to Harmonic oscillation. Harmonic oscillators occur widely in nature and are exploited in many manmade devices, such as clocks and radio circuits. When the spring is released, it tries to return to equilibrium, and all its potential energy converts to kinetic energy of the mass.
So… unfortunately, the weight loss effects appear to be both weak and inconsistent. A review published in the Journal of Obesity in 2011 that looked at 12 clinical trials found that Garcinia Cambogia can increase weight loss by about 0. 88 kg, or 2 pounds, on average, over a period of several weeks (13). Their conclusion sums it up quite nicely: …Garcinia extractsHCA can cause short-term weight loss. The magnitude of the effect is small, and the clinical relevance is uncertain.